[R] RGB -> CYMK, with consistent colors

[PIKAL Petr]

Hi.

CMYK and RGB are physically different concepts of colour mixing
(subtractive/additive) and the only way how to achieve good results is to
calibrate the monitor and the printer (which is hardly achievable in home
conditions). Usually DTP professionals are equipped for such kind of work.
Even then, the results could be slightly different as the whole colour space
is not achievable by only several (4 at least) pigments. And also colour is
not simple thing but basically a process involving light, target and person
who perceives it.

If you insist on achieving good printed results, the best way is to print it
and adjust colour(s) to be pleasing. However you cannot control others so if
anybody prints your book he hardly get the same result as you.

Cheers
Petr

> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of Derek M Jones
> Sent: Sunday, November 29, 2020 7:23 PM
> To: Martin Møller Skarbiniks Pedersen <traxplayer using gmail.com>
> Cc: R mailing list <r-help using r-project.org>
> Subject: Re: [R] RGB -> CYMK, with consistent colors
> 
> Martin,
> 
> > Have you tried printed a few pages in CMYK?
> >
> > A monitor is based on mixing light using Red-Green-Blue. So it is not
> > possible for the monitor to show CMYK which must be printed on paper
> > to view correctly.
> 
> Yes, I have printed some 'CMYK' pages.
> 
> The blue is very obviously not cyan, as compared to printing the RGB
version.
> 
> --
> Derek M. Jones           Evidence-based software engineering
> tel: +44 (0)1252 520667  blog:shape-of-code.coding-guidelines.com
> 
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